Elimination of striations in fluorescent lamps driven by high-fr

Details Elimination of striations in fluorescent lamps driven by high-fr Elimination of striations in fluorescent lamps driven by high-fr

1995-12-26

1997-12-23

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315166, 315224, 315DIG5, H05B 4114

Patent

active

057010595

ABSTRACT:
A ballast system for at least one dimmable fluorescent lamp includes a ballast inverter for driving the fluorescent lamp to provide light output and a parallel impedance for coupling across the fluorescent lamp for providing an alternative path for diverting sufficient ac current to avoid developing striated light output as the light output is dimmed. The parallel impedance may be a resistor connected in series with a diode. For multiple lamp systems, the parallel impedance may be connected across one or more of the lamps.

REFERENCES:
patent: 4682082 (1987-07-01), MacAskill et al.
patent: 5001386 (1991-03-01), Sullivan et al.
patent: 5192896 (1993-03-01), Qin
patent: 5369339 (1994-11-01), Reijnaerts
"Development of an Electronic Dimming Ballast for Fluorescent Lamps", A. Okude, A. Ueoka, Y. Kambara, M. Mitani., Journal of the Illuminating Engineering Society, Winter, 1992.

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